Malicious PDF — malware analysis report

Static analysis result for SHA-256 c194260332b9541d…

MALICIOUS

PDF

93.7 KB Created: 2021-07-27 18:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d15ecf2b75eae3ab4af06bed03f68c0 SHA-1: 3bf8fbe32df0e13ac29a40e1a89633fd3f122d53 SHA-256: c194260332b9541d6636ed981fa120f9c4219f3a0b390bc0cd56824f89ef92c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or SEO poisoning attempt. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9fdc8559---gupapexix.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/fexosagupadezaneju.pdf
    • http://banhangcongnghe.com/upload/FCK/file/27891779165.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajuwutasanamamib.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512075353981586.pdf
    • http://kursadowicz.pl/Upload/file/kuninokamezatasepimavagol.pdf
    • http://fitsiluet.cz/data/file/dajudavimasuxirezam.pdf
    • http://asirakademi.com/resimler/files/68859814857.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/lamekepuzejufizuxapedow.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160713cc27ca66---miruwexodubod.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160964796aaf88---3528876109.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/11d2693e56dbb95fc0c90555f1c2e0d0/1171099407.pdf
    • http://thesecurityguardunion.ca/userfiles/files/fedebojinakupile.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b04eb6d---furuwibaw.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/61a7d56bf3c6b83abe062f72b80a56a7/sukekajafufelutazodezavo.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/084e5d830ff97d9efe7f63299e18fe8c/misuwibene.pdf
    • http://bi-acaovo.com/upload/files/rakige.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/3fcffcf7bd47b2c2327db97f814a6305/95498732430.pdf
    • http://kursadowicz.pl/Upload/file/nelosiniwililagamevem.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9e18414c2345df23d7fbbee319981f46/35750031980.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160993c436136f---36498184024.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/sodonoz.pdf
    • https://topupdana.com/contents//files/xosupaxagizedipolenutokin.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b331a166a390f313594d473b9386637c/24167838094.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+luigi+in+new+super+mario+bros+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa6b.bin
0555e8f93d4929bca69995f1dc59950dc9fb5f52e3fb148e55c7cfcad9ae7e07
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 19528 bytes
font_01_sfnt_off00012ae7.bin
c822409f102abdafa4ceb6d5cbee1264fe50a9848f5507aa2f674b987c81705e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE7 11032 bytes
font_02_sfnt_off0001445f.bin
f4000b3042de0701b680183234b32841b94bb1ab5f0007d10b115ace3b758977
pdf-font-stream PDF embedded font (sfnt) at offset 0x1445F 2700 bytes
font_03_sfnt_off00014fae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAE 16792 bytes